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Unfortunately we cannot support it this way. There are
different types of messages (Voicemails, Faxes, SMS, etc.) and not all of them can be really “forwarded”,
so we cannot add this capability in our general message-store API. Another
reason is that forwarding will create a new
message, but just the content
will be cloned. And this is not what is usually expected by calling PUT in the RESTful API world
(because PUT modifies existing record, not creates new).

You are probably interested in some particular use case,
like forwarding a text message. We could support it in the future. Please let us know what particular scenarios
you need us to support in our API and we will consider them in our future design and
implementation plan.